Elbow



FIG. 1 is a perspective view of an elbow showing a new design;

FIG. 2 is a top view of the elbow of FIG. 1;

FIG. 3 is a left side view of the elbow of FIG. 1;

FIG. 4 is a right side view of the elbow of FIG. 1;

FIG. 5 is a front view of the elbow of FIG. 1;

FIG. 6 is a rear view of the elbow of FIG. 1; and,

FIG. 7 is a bottom view of the elbow of FIG. 1. 

CLAIM What is claimed is the ornamental design for an elbow, as shown and described. 